Witajcie programistki i programiści :)
Wkrótce będziecie musieli ze mną pracować, jednak za nim to nastąpi męczę samego siebie w domu.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at main.Main.update(Main.java:38)
at sun.awt.RepaintArea.updateComponent(Unknown Source)
at sun.awt.RepaintArea.paint(Unknown Source)
at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Linia 38:
public void paint(Graphics g){
rectangl.setBounds(p.getX(), p.getY(), 10, 50); //o tutaj
//...
}
Wywołuję ją z wątku, z innej klasy:
public void ruch() {
TimerTask task = new TimerTask() {
public void run() {
ball_x-=1;
main.repaint();
}
};
Timer timer = new Timer();
timer.schedule(task, 0, 0);
}
}
Co powoduje ten błąd? Jak go naprawić?
Pozdrawiam,
Adrian